:root{--bg: #15100e;--panel: #221813;--line: #3a2a22;--ink: #f5ece7;--dim: #b39c90;--accent: #c0533a;--good: #5fae72;--warn: #d8a23a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#251713,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:560px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:28px;letter-spacing:6px;font-weight:800;color:var(--accent)}.sub{margin:3px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:10px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden}.seg button{background:none;border:none;color:var(--dim);padding:6px 13px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#1a0c08}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.btn.primary{background:var(--accent);color:#1a0c08;border-color:var(--accent)}.scoreboard{display:flex;gap:8px;justify-content:center;margin:8px 0;flex-wrap:wrap}.readout{background:#0e0907;border:1px solid var(--line);border-radius:8px;padding:5px 14px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:78px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative}#board{min-height:240px}.qcard{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px}.qmeta{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}.tag{font:700 11px ui-monospace,monospace;color:var(--dim);background:#0e0907;border:1px solid var(--line);border-radius:999px;padding:3px 9px}.tag.kind{color:var(--ink);text-transform:uppercase;letter-spacing:.5px}.tag.pts{color:var(--good)}.tag.time{color:var(--warn)}.tag.prob{color:var(--accent)}.qprompt{font:700 19px ui-monospace,monospace;line-height:1.4;margin:4px 0 16px;word-break:break-word}.choices{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:14px}.choice{background:#0e0907;border:1px solid var(--line);color:var(--ink);padding:12px;border-radius:10px;font:800 18px ui-monospace,monospace;cursor:pointer}.choice:hover{border-color:var(--accent)}.choice.picked{background:var(--accent);color:#1a0c08;border-color:var(--accent)}.choice.ans{outline:2px solid var(--good)}.choice.wrongpick{background:#5a1f1a;color:#ffb3a8;border-color:#5a1f1a}.qactions{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:12px}.abtn{border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:11px 0;border-radius:10px;font:800 14px system-ui;cursor:pointer}.abtn.solve:hover,.abtn.solve.on{background:var(--good);color:#06210f;border-color:var(--good)}.abtn.guess:hover,.abtn.guess.on{background:var(--warn);color:#2a1c04;border-color:var(--warn)}.abtn.skip:hover,.abtn.skip.on{background:var(--accent);color:#1a0c08;border-color:var(--accent)}.qnav{display:flex;gap:8px;justify-content:space-between}.qnav .btn{flex:1}.strip{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;margin:14px 0 4px}.dot{width:30px;height:30px;border-radius:8px;border:1px solid var(--line);background:#0e0907;color:var(--dim);font:700 12px ui-monospace,monospace;cursor:pointer}.dot.cur{box-shadow:inset 0 0 0 2px var(--accent);color:var(--ink)}.dot.solve{background:var(--good);color:#06210f;border-color:var(--good)}.dot.guess{background:var(--warn);color:#2a1c04;border-color:var(--warn)}.dot.skip{background:#3a2a22;color:var(--ink)}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0c0705d1;border-radius:12px;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px 26px;text-align:center;max-width:340px}.card h2{margin:0 0 6px;font-size:26px;color:var(--accent)}.card p{margin:6px 0;color:var(--dim);font-size:14px;line-height:1.6}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:14px;line-height:1.6}.hint b{color:var(--ink)}